#!/bin/sh

set -e

if [ -z "$1" -o -z "$2" ]
then
    echo "Usage: $0 <iso> <arch>"
    exit 1
fi

for bin in 7z
do
    if ! command -V "$bin" 2>&1 > /dev/null
    then
        echo "Missing utility: $bin"
	exit 1
    fi
done

DIR="$(pwd)"
ISO="$(realpath "$1")"
ARCH="$2"
TMP="$(mktemp -d)"

cd "$TMP"
trap "rm -rf '$TMP'" EXIT

mkdir -p iso rootfs/var/lib/pkg
touch rootfs/var/lib/pkg/db

(cd iso; 7z x "$ISO")
RELEASE="$(cat iso/crux-media)"
VERSION="${RELEASE%-*}"
DATE="${RELEASE#*-}"
for i in iso/crux/core/*.pkg.tar.*
do
    echo "Adding $(basename "$i")"
    pkgadd -r rootfs "$i"
done
rm -rf iso

# Insert hostname templates
sed -i -e '/HOSTNAME=/cHOSTNAME=LXC_NAME' rootfs/etc/rc.conf
sed -i -e 's;localhost.*;& LXC_NAME;' rootfs/etc/hosts

# Fix default networking
cat > rootfs/etc/rc.d/net << 'EOF'
#!/bin/sh
#
# /etc/rc.d/net: start/stop network interface
#

case $1 in
    start)
        /sbin/dhcpcd -4 eth0
        ;;
    stop)
        /sbin/dhcpcd -x eth0
        ;;
    restart)
        $0 stop
        $0 start
        ;;
    *)
        echo "Usage: $0 [start|stop|restart]"
        ;;
esac
EOF

# Disable agettys in containers as they don't work
# Enable a login console for LXC/LXD usage
# Remove existing powerfail entries
# Add an entry to allow LXC/LXD to shutdown the container
sed -i \
    -e 's;^[^#].*agetty;#&;' \
    -e '/s1:2:/acon:2:respawn:/sbin/agetty 38400 console' \
    -e '/:powerfail:/d' \
    -e '/ctrlaltdel/cpf::powerfail:/sbin/telinit 0' \
    rootfs/etc/inittab

# Disable klogd in containers as it doesn't work
sed -i -e '/KLOG/d' -e 's;and klog ;;' rootfs/etc/rc.d/sysklogd

# Export a default LANG
sed -i -e '/LESS=/iexport LANG="C"' rootfs/etc/profile

# Create the LXC metadata tarball
cat > config << EOF
lxc.include = LXC_TEMPLATE_CONFIG/common.conf
lxc.arch = $ARCH
EOF
cat > excludes << 'EOF'
dev/*
EOF
cat > config-user << EOF
lxc.include = LXC_TEMPLATE_CONFIG/common.conf
lxc.include = LXC_TEMPLATE_CONFIG/userns.conf
lxc.arch = $ARCH
EOF
cat > excludes-user << 'EOF'
dev/*
EOF
cat > templates << 'EOF'
/etc/rc.conf
/etc/hosts
EOF
cat > create-message << EOF
You just created a CRUX $VERSION $ARCH ($DATE) container.
EOF
tar -c -f - config excludes config-user excludes-user templates create-message | xz -9 > "$DIR/crux-$VERSION-$ARCH-$DATE-lxc.tar.xz"
rm -rf config config-user create-message excludes-user templates

# Create the LXD metadata tarball
mkdir -p templates
sed -e 's;LXC_NAME;{{ container.name }};' rootfs/etc/rc.conf > templates/rc.conf.tpl
sed -e 's;LXC_NAME;{{ container.name }};' rootfs/etc/hosts > templates/hosts.tpl
cat > metadata.yaml << EOF
architecture: $ARCH
creation_date: $(date +%s)
properties:
  architecture: $ARCH
  description: CRUX $VERSION $ARCH ($DATE)
  name: crux-$VERSION-$ARCH-$DATE
  os: crux
  release: "$VERSION"
  serial: "$DATE"
templates:
  /etc/rc.conf:
    when:
    - create
    - copy
    create_only: false
    template: rc.conf.tpl
  /etc/hosts:
    when:
    - create
    - copy
    create_only: false
    template: hosts.tpl
EOF
tar -c -f - templates/ metadata.yaml | xz -9 > "$DIR/crux-$VERSION-$ARCH-$DATE-lxd.tar.xz"
rm -rf templates/ metadata.yaml

# Create the root tarball
(cd rootfs; tar -c -f - *) | xz -9 > "$DIR/crux-$VERSION-$ARCH-$DATE-rootfs.tar.xz"
rm -rf rootfs